Added magnetometer calibration to pilot plugin.
Also pass some events through the websocket.
Switched to git repo for dependencies

Since this development branch is moving really fast, and
depending on other projects movins as well, I switched to
git for dependencies.

Will fix dependencies to version when packaging a release.
Switched to new API
Merge pull request #11 from wiseman/magnetocompass

Added magnetometer calibration to pilot plugin.
Removed trailing whitespaces
Fixed tabs/space mixup
Update README.md
Added a proper check for existing config file
Added support for multiple keypress to pilot plugin

Closes #4
Update README.md